单跨框架改多跨框架结构的抗震性能分析  

Seismic performance analysis of single-span frame structure transformed into multi-span frame structure

作　　者：杨小卫[1] 李梦园 雷立志 胡江春[1] Yang Xiaowei;Li Mengyuan;Lei Lizhi;Hu Jiangchun(School of Civil Engineering and Architecture,Zhongyuan University of Technology,Zhengzhou Henan 450007,China;Wuhan Hongtai Construction Engineering Quality Inspection Co.,Ltd.,Wuhan Hubei 430074,China)

机构地区：[1]中原工学院建筑工程学院,河南郑州450007 [2]武汉弘泰建筑工程质量检测有限公司,湖北武汉430074

出　　处：《山西建筑》2023年第18期57-59,共3页Shanxi Architecture

基　　金：深圳大学结构工程研究所开放研究基金项目(SZURISE:2019-05)。

摘　　要：通过在单跨框架结构教学楼的走廊外端增设框架柱形成连续框架,可以增加超静定次数并提高抗震性能。但在这类结构的实际加固设计中,由于原结构体系的变形以及传力路径已基本完成并稳定,改造形成的连续框架与一次建设形成的连续框架的受力形式在整体性能以及构件内力上均有区别,引起两种连续框架的抗震性能也有所不同。通过对某工程的动力弹塑性时程分析,研究了加固设计中竖向荷载分担对增跨加固框架抗震性能计算结果的影响。研究发现不考虑原框架柱的实际受力状态的改造设计会导致顶点最大位移计算偏小、罕遇地震下弹塑性层间位移角计算偏小的不利结果,高估了结构整体“大震不倒”的能力。By adding frame columns at the outer end of the corridor of the single-span frame structure teaching building to form a continuous frame,the number of statically indeterminate can be increased and the seismic performance can be improved.However,in the actual strengthening design of this kind of structure,because the deformation and force transfer path of the original structural system have been basically completed and stable,the stress forms of the reformed continuous frame and the continuous frame formed by the first construction are different in the overall performance and the internal force of members,resulting in the seismic performance of the two kinds of continuous frames are also different.Based on the dynamic elastoplastic time-history analysis of a project,this paper studies the influence of vertical load sharing in reinforcement design on the seismic performance calculation results of span-increasing reinforced frames.It is found that the reconstruction design without considering the actual stress state of the original frame column will lead to the unfavorable result that the calculation of the maximum displacement of the vertex is too small,and the calculation of the elastic-plastic interstory displacement angle under rare earthquake is too small,which overestimates the ability of the whole structure to“not collapsing under large earthquake”.

关 键 词：单跨框架 多跨框架 新老柱轴压分布 抗震性能 

分 类 号：TU313.3[建筑科学—结构工程]